From b41d7d05b7a7ab56d961c144ca93b15de0fc4308 Mon Sep 17 00:00:00 2001 From: Jonathan Liu Date: Sat, 14 Jun 2014 08:59:09 +0200 Subject: sunxi: use random parts of SID to set ethaddr Similar to the USB NIC found on OMAP5uEVM, PandaBoard and BeagleBoard-XM boards, the sunxi SoCs have a NIC onboard without an embedded MAC address. Just like the omap used on these boards, the sunxi SoCs do have a unique chip id, in the form of the 128 bit SID register: http://linux-sunxi.org/SID_Register_Guide So mimick the BeagleBoard-XM board code (commit 548a64d8) and use the chip id to generate a unique fixed MAC address. We check for the SID not being all 0, since some early A20 batches shipped without having there SID programmed. Note we use specific parts of the 128 bits, since some parts indicate the SoC family / revision, and thus are fixed. The algorithm for this was taken from the linux-sunxi.org kernels. Signed-off-by: Jonathan Liu [hdegoede@redhat.com: Expanded the commit message with some more info] Signed-off-by: Hans de Goede Acked-by: Ian Campbell --- board/sunxi/board.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'board/sunxi') diff --git a/board/sunxi/board.c b/board/sunxi/board.c index 8607eb3..2179e23 100644 --- a/board/sunxi/board.c +++ b/board/sunxi/board.c @@ -19,9 +19,12 @@ #include #endif #include +#include #include #include #include +#include +#include DECLARE_GLOBAL_DATA_PTR; @@ -157,3 +160,28 @@ void sunxi_board_init(void) printf("Failed to set core voltage! Can't set CPU frequency\n"); } #endif + +#ifdef CONFIG_MISC_INIT_R +int misc_init_r(void) +{ + if (!getenv("ethaddr")) { + uint32_t reg_val = readl(SUNXI_SID_BASE); + + if (reg_val) { + uint8_t mac_addr[6]; + + mac_addr[0] = 0x02; /* Non OUI / registered MAC address */ + mac_addr[1] = (reg_val >> 0) & 0xff; + reg_val = readl(SUNXI_SID_BASE + 0x0c); + mac_addr[2] = (reg_val >> 24) & 0xff; + mac_addr[3] = (reg_val >> 16) & 0xff; + mac_addr[4] = (reg_val >> 8) & 0xff; + mac_addr[5] = (reg_val >> 0) & 0xff; + + eth_setenv_enetaddr("ethaddr", mac_addr); + } + } + + return 0; +} +#endif -- cgit v1.1